Final answer:
Ford is discussing the principle of separation of powers in the Constitution.
Step-by-step explanation:
The principle of the Constitution that Ford is discussing is separation of powers. The Framers of the Constitution divided the government into three separate branches - legislative, executive, and judicial - and assigned different responsibilities and powers to each branch. This system ensures that no single branch becomes too powerful and that they must work together to govern the nation. For example, Congress has the power to draft legislation, but the president must sign it into law, demonstrating the need for cooperation between the branches.